Feature comparison of performance analysis tools

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Feature	Firebug	AOL Page Test	Fiddler	HttpWatch	MySpace	VRTA	YSlow	Google Page Speed
File:Performance grade.png Performance grade							+	+
Content download diagram	+	+	2.x beta	+	+	+
Connection diagram		+
Content breakdown diagram		+
Zooming in and out				+/- (single request)	+
Rendering progress screen shots		+/- (at render start, onLoad and complete)			+
Connection diagram by content type		+
File:Showing connection siblings on waterfall diagrams.png Showing connection siblings on waterfall diagrams
File:Display JavaScript function executions on a timeline.png Display JavaScript function executions on a timeline
Running both empty-cache and primed-cache cases		+
File:Showing cache hits.png Showing cache hits				+
File:Showing render start event.png Showing render start event		+
File:Showing document onload event.png Showing document onload event		+
File:Showing custom events.png Showing custom events		+/- (single event)
File:Color-coding parts of the request/response.png Color-coding parts of the request/response
File:Showing time-chart of each request.png Showing time-chart of each request
File:Showing request/response headers.png Showing request/response headers		+
File:Ability to select only subset of requests.png Ability to select only subset of requests
File:Ability to analyze SSL traffic.png Ability to analyze SSL traffic		+
File:Ability to decode compressed traffic.png Ability to decode compressed traffic		+
File:Display content-type icon.png Display content-type icon
File:Display hostname field separately.png Display hostname field separately
File:Displaying metric summary for a page.png Displaying metric summary for a page		+
File:Color-coding queued/blocked state of the request.png Color-coding queued/blocked state of the request
File:Ability to delete unwanted requests from analysis.png Ability to delete unwanted requests from analysis		+
File:Color-coding by error code.png Color-coding by error code		+/- (3xx/error)
File:Request content preview.png Request content preview
File:Ability to export result.png Ability to export result		+
File:Ability to run automatically.png Ability to run automatically
File:Ability to automatically send results to remote server.png Ability to automatically send results to remote server
Ability to script sequence of pages to navigate		+/- (results only recorded for last page in sequence)
File:CPU load monitoring.png CPU load monitoring

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